president obama will be hosting a news conference at 5:30 eastern time on the gun control measure. and "fast money" will take us live to that. stay tuned for that. michelle? >> bill, the latest from boston is the authorities have solid leads but as of now, no arrest. joining us is clint van zandt. he's a former hostage negotiator. he worked on many cases from the oklahoma city bombings to the unabomber. >> welcome back. >> good to be with you. >> based on everything we know about the bomb that was used, what kind of person did this? >> even though the bomb itself has roots in asia, the middle east, this is a popular device on the internet we know for example in 2011 a former soldier at fort hood built two similar devices that he was going to attack the military that major nadal hasan did. it would be easy for one person to do this. easier for two. no indication that it's a group whatsoever. >> why don't you think anybody's taken credit for this? what's the point if you're going to do this and not make a statement at some point that's obvious? >> for example the anthrax centers. the